Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 2

11. Can a free running LMC555 VCO discharge its timing cap to zero?
    Stephen Woodward
    Circuits Analogue Design Oscillators Texas Instruments LMC555
    .. In fact, at the price of an extra resistor, it might be possible to improve linearity enough to pick up another half a volt and half an octave on both ends of the pitch range to span 177 Hz to 1410 Hz. See Figure 4 and Figure 5. Figure ...
    .. design idea (DI) contributor Nick Cornford recently published a synergistic pair of DIs “A pitch-linear VCO, ...
    Mar 24, 2025

12. A simple, purely analog -130 dB THD sine wave generator
    Christopher Paul
    Circuits Oscillators onsemi NE570 SA571
    .. recent Design Idea “Getting an audio signal with a THD 0.0002% made easy” [ 1 ] discloses a low THD sine ...
    Mar 7, 2025

13. Three discretes suffice to interface PWM to switching regulators
    Stephen Woodward
    Circuits Supply Microcontrollers Usage Texas Instruments TPS54332
    .. (N-2) T PWM /R 2 , where N is number of PWM bits and T PWM is the PWM period. Since C F will never see more than perhaps a volt, its voltage rating isn’t much of an issue. A cool feature of this simple topology is that, unlike many ...
    Mar 7, 2025
14. Simple setup tests bit-error rate
    Israel Schneiderman
    Circuits Digital Texas Instruments LM393 SN74HC74 SN74HC86
    .. you measure the BER in the lab by applying an RF signal, modulated by a pseudorandom code, to the receiver under test. This Design Idea suggests an alternative method based on the use of a simple square wave. This method may not be superior ...
    Mar 4, 2025
15. 1 A, 20V PWM DAC current source with tracking preregulator
    Stephen Woodward
    Circuits Supply Microchip MIC2253
    .. design idea reprises another “1 A, 20 V, PWM controlled current source” ( Ref. 1 ). Like the earlier ...
    Mar 4, 2025
16. Design an RTD interface with a spreadsheet
    Robert S. Villanucci
    Circuits Analogue Design Measurement Analog Devices AD633 OP177
    .. the system is to achieve a high level of precision. One way to obviate the nonlinear characteristic of an RTD sensor is to design analog hardware to perform the curve-fitting mathematics before any additional signal processing occurs. This ...
    Feb 25, 2025
17. A precision digital rheostat
    Stephen Woodward
    Circuits Analogue Design Supply Microchip MCP4131
    .. tolerance. These limitations conspire to make Dpots a difficult medium for implementing precision rheostats. Recent EDN design idea (DI) articles have addressed these issues with a variety of strategies and topologies: Op-amp wipes out ...
    Feb 25, 2025
18. Tracking preregulator boosts efficiency of PWM power DAC
    Stephen Woodward
    Circuits Supply Fairchild LM317 2N3906
    .. design idea revisits another: “PWM power DAC incorporates an LM317” ( Ref. 1 ). Like the earlier ...
    Feb 17, 2025
19. 1-A, 20-V, PWM-controlled current source
    Stephen Woodward
    Circuits Supply ON Semiconductor LM337
    .. design idea (DI) takes an unusual path to a power-handling DAC by merging an upside-down LM337 regulator with a ...
    Feb 7, 2025
20. Metal detector uses single IC
    Rachel Hageman Steve Hageman
    Circuits Measurement National Semiconductor LM389
    .. input capacitors, or approximately 2 nF) of the Q 1 oscillator determine the frequency of the search oscillator. In this design, the frequency is approximately 370 kHz. For years, this frequency has prevailed in metal detectors, because ...
    Feb 5, 2025

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